/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.alipay.disruptor;

import com.alipay.disruptor.support.DummyEventHandler;
import org.junit.Test;

import static org.hamcrest.CoreMatchers.is;
import static org.junit.Assert.assertThat;

/**
 * @description: [test for AggregateEventHandler]
 * @email: <a href="guolei.sgl@antfin.com"></a>
 * @author: guolei.sgl
 * @date: 18/8/1
 */
public class AggregateEventHandlerTest {
    private final DummyEventHandler<int[]> eh1 = new DummyEventHandler<int[]>();
    private final DummyEventHandler<int[]> eh2 = new DummyEventHandler<int[]>();
    private final DummyEventHandler<int[]> eh3 = new DummyEventHandler<int[]>();

    @Test
    public void shouldCallOnEventInSequence() throws Exception {
        final int[] event = { 7 };
        final long sequence = 3L;
        final boolean endOfBatch = true;
        final AggregateEventHandler<int[]> aggregateEventHandler = new AggregateEventHandler<int[]>(
            eh1, eh2, eh3);
        aggregateEventHandler.onEvent(event, sequence, endOfBatch);
        assertLastEvent(event, sequence, eh1, eh2, eh3);
    }

    @Test
    public void shouldCallOnStartInSequence() throws Exception {
        final AggregateEventHandler<int[]> aggregateEventHandler = new AggregateEventHandler<int[]>(
            eh1, eh2, eh3);
        aggregateEventHandler.onStart();
        assertStartCalls(1, eh1, eh2, eh3);
    }

    @Test
    public void shouldCallOnShutdownInSequence() throws Exception {
        final AggregateEventHandler<int[]> aggregateEventHandler = new AggregateEventHandler<int[]>(
            eh1, eh2, eh3);
        aggregateEventHandler.onShutdown();
        assertShutoownCalls(1, eh1, eh2, eh3);
    }

    @Test
    public void shouldHandleEmptyListOfEventHandlers() throws Exception {
        final AggregateEventHandler<int[]> aggregateEventHandler = new AggregateEventHandler<int[]>();
        aggregateEventHandler.onEvent(new int[] { 7 }, 0L, true);
        aggregateEventHandler.onStart();
        aggregateEventHandler.onShutdown();
    }

    private static void assertLastEvent(int[] event, long sequence, DummyEventHandler<int[]>... eh1) {
        for (DummyEventHandler<int[]> eh : eh1) {
            assertThat(eh.lastEvent, is(event));
            assertThat(eh.lastSequence, is(sequence));
        }
    }

    private static void assertStartCalls(int startCalls, DummyEventHandler<int[]>... handlers) {
        for (DummyEventHandler<int[]> handler : handlers) {
            assertThat(handler.startCalls, is(startCalls));
        }
    }

    private static void assertShutoownCalls(int startCalls, DummyEventHandler<int[]>... handlers) {
        for (DummyEventHandler<int[]> handler : handlers) {
            assertThat(handler.shutdownCalls, is(startCalls));
        }
    }
}